2. You issue the command ALTER DATABASE CLEAR LOGFILE GROUP 2, and
it fails with the message “ORA-01624: log 2 needed for crash recovery of
instance orcl11g (thread 1).” What could be an explanation for this? (Choose
the best answer.)
A. Log file group 2 is active.
B. Log file group 2 is being used for recovery.
C. The database has not been checkpointed.
D. The group is not multiplexed.
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